Planting & SoilQuestion 33 of 100
Gypsum is added to certain clay soils primarily to accomplish what?
a.Lower soil pH significantly
b.Improve structure and displace sodium in sodic soils
c.Add large amounts of nitrogen
d.Kill weed seeds
Explanation
Gypsum, calcium sulfate, supplies calcium that replaces sodium in sodic clay soils, improving aggregation and water penetration. It changes soil structure and drainage without appreciably altering pH. It is not a fertilizer and does not add nitrogen.
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